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Real Estate Investments - Dispositions (Textual) (Details) $ in Thousands | Jun. 30, 2018 USD ($) a | Dec. 31, 2017 USD ($)
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Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Assets held for sale, net | $ 4,254 | $ 392
Pennsylvania Suburbs [Member] | Assets Held-for-sale [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Acreage of land | a | 2.7 |
Pennsylvania Suburbs [Member] | Assets Held-for-sale [Member] | Land Held For Development [Member] |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Assets held for sale, net | $ 4,300 |

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